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class="skimtim"><em>發(fā)布日期：</em>2013-04-22 </span> </div> 　<span style="color: #ff0000">　hbzhan內容導讀：目前，<strong><a >在線自動分析儀</a></strong>的主要技術原理有化學滴定法、電化學丈量法、可見和紫外分光光度法。<br /></span>　　<br />　　第1種方法是建立在吸收定律之上的一種利用被測物質的分子或離子對特征電磁輻射的吸收程度進行定量分析的方法。實驗證實，紫外吸光度能反映水中有機污染的程度，特別是對水中的一大類芳香族有機物和帶雙鍵有機物尤為靈敏。很多資料亦表明紫外吸光度和一些主要水質替換參數(shù)具有一定的相關性[4]，因此，通過分析紫外吸光度來獲得水質參數(shù)具有極為重要的理論與實際意義。<br />　　<br />　　第2種方法的原理是通過化學滴定來確定水質參數(shù)的含量。其缺點是丈量時間過長、操縱維護復雜，運行本錢高，同時還會產生二次污染。<br />　　<br />　　第3種方法的原理是利用水中有機物在工作電極表面被氧化的同時，工作電極上將有電流變化，當工作電極的電位衡定時，電流的變化與水中的水質參數(shù)成線性關系。通過計算電流的變化便可測出水質參數(shù)。其主要特點是丈量速度快，儀器結構簡單，沒有二次污染。缺點是通過不同電化學法產生的電極電流變化只和一種替換參數(shù)有線性關系，和其他水質參數(shù)則存在非線性的關系。因此一般以電化學法為原理的在線分析儀只能丈量一種水質參數(shù)。<br />　　<br />　　該文介紹的是一種<strong><a >新型在線紫外光譜水質分析儀</a></strong>，以紫外分光光度法為原理，采集水樣在紫外區(qū)的全波段光譜，通過分析光譜數(shù)據(jù)的相關性，獲得全光譜中的特征光譜。然后利用智能軟件的算法分析光譜和各水質參數(shù)的關系，建立相關猜測模型。實驗結果表明，該水質分析儀有丈量速度快、精度高、跟蹤性能好、操縱簡便的特點，和同類產品相比具有極大的上風。 <div class="9p3buoh" id="news_sx"><li id="vlr3hj0" class="sx_left">上一篇：<a 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